摘要
在φ148mm的振动圆柱型流化床中，采用光导纤维浓度测量仪测量了床层局部空隙率的波动．对空隙率波动偏差的分析表明，振动参数、颗粒物性和操作参数均对床层均匀流化行为有不同程度的影响，且振幅和振动频率越大越能明显提高以小米或玻璃珠为物料的床层的均匀稳定性，两颗粒物性和操作参数直接影响振动能量在床层中的传播．根据实验结果，提出并定义了一个振动均匀操作判别系数，这对选择实际振动流化床的操作范围具有一定的指导意义．
The effects of vibration parameters, operating condition and material properties on bed uniformity and stability were investigated by means of measurement and analysis ofthe voidage fluctuation signals in a vibrating fluidized bed with diameter of 148 mm. The fluctuating deviation of bed voidage and the enhancement index of bed uniformity derived in thisstudy can describe respectively the bed uniformity and its extent. A new criterion of demarcation of uniformity, composed of material parameter (Ki), operating parameters (H0, u/umf)and vibration parameters (a, w), can be used to predicting a suitable range of bed uniformity.According to experimental results on & kinds of solids, 5 static bed heights and dchrent vibration parameters, the better operating conditions were proposed as a guideline of reasonableselection of operating conditions for vibrating fluldization.
出处
《化工冶金》
CSCD
北大核心
1999年第3期247-254,共8页
基金
中国科学院院长特别基金
